Grip for polishing-rods.



PATENTED AUGZlS, 1907. L. A. SMITHSON.

GRIP FOR POLISHING RODS.

PPPPPP ATION TILED MAR. so, 1906.

LLOYD A. SMITHSON, OF WARREN, INDIANA.

GRIP FOR POLISHING-RODS.

Specification of Letters Patent:

Patented Aug. 13, 1907.

Application filed March 30,1906. Serial No. 308,934.

To all whom it may concern:

Be it known that I, LLOYD A. SMITHsoN, a citizen of the United States,residing at Warren, in the county of Huntington and State of Indiana,have invented certain new and useful Improvements in Grips forPolishing-Rods; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it apper tains to make and use thesame.

My invention relates to new and useful improvements in grips and moreparticularly to that class adapted to be used in connection withpolishing rods for oil wells.

The object of my invention is to produce a grip of this character whichmay be used in connection with sew eral sized rods.

A further object is to provide means on said grip whereby the clampingbolt will be prevented from ro tating while the nut is being placedthereon Other objects and advantages will be hereinafter re ferred toand pointed out in the claims.

In the accompanying drawings which are made a part of this application,Figure 1 is a perspective view of my improved clamp applied to a sectionof a polishing rod, and, Fig. 2 is a central horizontal sectiontherethrough.

Referring to the several parts of my invention in which like numeralsdesignate like parts throughout the drawings, 1 indicates a polishingrod of the usual well known form, to which is secured my improved grip,said grip comprising clamping members 2 and 3, said members beingprovided at one end with registering hinge sections 4 and 5,respectively, said sections being provided with registering openingsthrough which is inserted a bolt or pin 6 The opposite ends of themembers 2 and 3 are elongated and flattened to provide clamping arms 7and 8 respectively. These arms are provided with registering openingstherein, through which is adapted to take a clamping bolt 9, said boltbeing provided with a square head at one end and threaded at itsopposite end to receive a nut 10.

As best shown in Fig. 2 of the drawing, one face of the head 11 of thebolt abuts against a shoulder formed at the meeting point between themember 3 and the clamping arm 8, whereby the bolt 9 is prevented fromturning when the nut 10 is being driven thereon. The meeting faces a andb of the members 2 and 3 are slightly tapered from their junction withthe hinge sections 4 and 5 to their outer ends thereby forming asubstantially V-shaped space between the faces when they are broughttogether to clamp the rod, whereby the polish rod can be more securelygripped in the ways 12 and 13 formed in said members 2 and 3. It willtherefore be seen that by tapering the meeting faces of the members 2and 3 and providing the V-shaped space, that different sized rods may begrasped and securely held in the ways 12 and 13 and it will also be seenthat by providing the members with tapered faces that the faces of thearms 7 and 8 will not contact when directed towards each other. therebyexerting a stronger grip upon the rod and keeping the arms under tensionat all times, while gripping the rod.

What I claim is A grip for the purpose described consisting of bodymembers having semi-circular longitudinal ways therein, interlockinghinge members united at one end upon one side of said ways, rigid,unyielding clampingarms at the opposite sides of said ways and havingalining openings therein in their ends farthest from the pivot, theouter faces of said arms being parallel and their inner faces tapered toform a V-shaped space extending in unbroken lines from the hinge to theouter ends of said arms, and a bolt passed through said openings andhaving at one end a head abutting against the adjacent portion of thebody member, and a nut adjustable 0n the other end of said bolt andbearing against the outer face of the other 211'111.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LLOYD A. SMI'JIISON.

Witnesses JOSEPH O. Kin's'rnn, Lnvr L. SIMONS.

